Mesh interferes with the texture of a plane
I don't know what you mean by the track interfering... but the texture mapping for the grassy plane is messed up.

First of all, your plane has been scaled in Object mode.

select Select the plane and press CtrlA and select Apply Rotation and Scale

(More on why you always want to apply your scale here and here) 

Next: 
Your plane has no UV map, so blender will not know how to map the image.

Go to top view. , enter edit mode select all (A) press U to unwrap the texture. 





(note that I changed the number of repeats for illustrations purposes...